Gree error code F4
What it means
Outdoor coil temperature sensor fault.
Possible causes
Coil thermistor open or short Sensor mounting loose or corroded Harness insulation damage
Suggested fix
Check sensor contact with the coil and wiring integrity, then verify resistance; repair mounting or harness and replace the thermistor if its readings are not within the expected range.
Safety first. Isolate the power supply before inspecting any unit. Refrigerant-circuit
and electrical repairs must be carried out by a qualified, registered technician.
Other Gree codes
- C5 — Configuration jumper or PCB setup error.
- E1 — High pressure protection in the refrigeration circuit.
- E3 — Low pressure protection.
- E5 — Overcurrent protection on compressor or main circuit.
- E7 — Mode conflict between indoor and outdoor units.
- F1 — Indoor ambient (room) sensor fault.
- F2 — Indoor evaporator temperature sensor fault.
- F3 — Outdoor ambient temperature sensor fault.
- F5 — Compressor discharge temperature sensor fault.
- H1 — Defrost mode status indication (not a fault).